[general "yes" to previous points]
On a side note it'll be interesting to see what facets for RDF files
other than "primary topic" will emerge. For example, in the
blogosphere there seems to be a rate-of-change axis: my blog has a
regular RSS feed [1] which changes 2 or 3 times a day. I also have a
FOAF profile that is likely to change maybe every 3 or 4 months [2].
Thanks to Morten's FOAF Output plugin, I also have a local
categorization scheme [3] used in the feed (built with SKOS) which is
only likely to change maybe once or twice a year, and there's also
some Creative Commons data which will change even less often than that
(I just noticed mine's not exposed anywhere - ah well, I've still not
got an RDF site map or linked in the Pet Profiles yet either...).
There is cross-referencing between all these, and no doubt some
duplication of statements too (a side effect is that the RSS uses 9
namespaces).
Before long I think we're likely to see an even more rapidly changing
'presence' data set ("currently listening to..."), maybe having a main
delivery protocol other than HTTP (i.e. Jabber).
Cheers,
Danny.
[1] http://dannyayers.com/feed/rdf/
[2] http://dannyayers.com/misc/foaf/foaf.rdf
[3] http://dannyayers.com/archives/author/site-admin/skos.rdf
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http://dannyayers.com